Skyrim SE|Skyrim LE|Enderal|Enderal SE|****Skyrim VR This is the paper interface replacer for almost all SkyUI menus (and most of those UI elemets that are not covered by SkyUI). 

Used Tools:

Photoshop - for textures
Inkscape - for vector graphics
JPEXS - for SWF files editing
1. Install the mod with mod manager, just follow the FOMOD installer instructions and choose whatever you like. I don't support manual installation, but if you really want to install it manually, of course you can. All the folders in the archive are named properly.

2. After installation you can open the file interface\deardiary\config.txt for enabling-disabling some options and to set transparency if you need it. There is detailed description for every option in that file. 

Completely safe to install / uninstall / update mid-game (of course if using any modern mod manager).
It's a big section, but don't be afraid...
Dear Diary is compatible with most mods, some mods are obsolete (Dear Diary has the same functions included), and even "incompatible" mods may be used without issues if you let them overwrite Dear Diary files, they just won't have a paper look or the UI will be visually inconsistent. 

General rule:
Let Dear Diary overwrite EVERYTHING
unless stated otherwise
Required:

SkyUI 5.1 by SkyUI Team

Obsolete / included / included similar functionality:
Wider MCM Menu by uranreactor (Dear Diary's MCM replacer is based on Wider MCM Menu opt.1)
Favorite Things by uranreactor (Dear Diary has favorites menu option with extended list)
Immersive Bookreading and Lockpicking by Wirodeu (option in config.txt)
Immersive Old Map Main Menu Replacer by Cdnas
Lockpick Pro (KenMOD) by Kenney (option in config.txt)
Better Messagebox Controls by ecirbaf
Smooth Interface (60 FPS) by ModdyMC or any other similar mod
Ultrawidescreen Fixes for Skyrim LE by ciathyza (install for Dialogue and Race menus if you need it and let Dear Diary overwrite it)
No Bethesda Logo In Menu by IceKK or any other similar mod
Smaller Map Markers for SkyUI by rusecraft (option in config.txt)
SkyUI Weapons Pack by Ashingda
Sleep Menu Extender by Kyoma (option in config.txt)
No Menu and Loading Smoke by IceKK
Show Armor Slots by b3lisario

Fully compatible:

Skyrim Souls by Kassent
Frostfall by Chesko - use with next two:
moreHUD by Ahzaab
moreHUD Inventory Edition by Ahzaab
Experience by zax
Extended UI by MrJack
Flat Map Markers by underthesky
MFG Console by kapaer
Paper World Map by Warburg or any other similar mod
Oblivionesque Category Icons by ElSopa and any other similar mods (overwrite Dear Diary with it)
Immersive Jewelry by Forteverum
Quick Loot by himika with unofficial update by user24601
Any cursor replacers (overwrite Dear Diary with it)
Any SkyUI-compatible map marker mods
Any new starting wallpaper mods
Any new loading screens mods
Any new fonts mods 
Any mods related to HUD (as Dear Diary doesn't change it)
Any new on-screen widgets
Any game language
Any retextures/remeshes of 3D UI elements, such as:
Skyrim Skill Interface Re-Texture by Arndas
JS Lockpicking UI by JohnSkyrim

Incompatible:

Categorized Favorites Menu by favmenumodder (and all countless derivatives)
SkyUI-Away by Mardoxx and other similar mods
Main Menu Design Replacer by Fozar (may be installed overwriting Dear Diary, but it won't have a paper look)
SkyUI AIO Survival (SAS) by Beven _ b3lisario
SkyUI - Vanilla Crafting menu by SilentMeowDawn
SkyUI Item Card Fixes by Gruffys or any other Item Card replacer other than moreHUD I.E. 
SkyUI The Adventurer Theme Mod by ElSopa (may be installed together with Dear Diary, but the UI will lose visual consistency; better to choose one or another)

Note:

If you use another mod that modifies the config.txt file from SkyUI and you don't want for some reason to fully overwrite it with mine, you'll need to "merge" two config.txt files. If you don't know how to do it, try asking mod author to make a patch for Dear Diary. 
I recommend using the included Friz Quadrata font (you can see it on screenshots), or Sovngarde font replacer by Mist, or Enderal font replacer (only for languages with latin alphabet). 

I don't recommend using the Reshade with this UI replacer, because Reshade alters everything on screen (while ENB works only for the game and not for the UI elemets). 

Some mods that fit "paper" theme:

Oblivion-like Loading Menu (separate from Dear Diary as I don't want to include any ESP here).
Paper UI Sounds by Muffloid - a project to replace Skyrim's UI sounds with paper sounds, to work with paper interface retextures and maps. Works great with my mod. 
Paper HUD by rob18 - to complement the HUD UI with very similar design. 
Take Notes - Journal of the Dragonborn by Lord Conti
If you have any misposition problems using this mod with mine, use SHIFT + ARROW KEYS to move journal manually.
Paper World Map by Warburg with Flat Map Markers SSE by underthesky
MAPS by Gamwich
Retexture for The Scroll by quilb
Business Ledger HD Retexture by LamboMan
Book Covers Skyrim and Book Covers Skyrim - Lost Library by DanielCoffey (not needed in case of playing with LotD)
Immersive Old Map Main Menu Replacer by Cdnas - already included to Dear Diary, but you still may want to endorse this nice mod
All the existing skins for now are available only at Skyrim SE Nexus. But you can safely download and install any of them manually and use it with Dear Diary LE. 

Wood and Paper by uranreactor (me): overall darker textures, nice for dungeon crawling. 
Dear Diary Ui Skins by K0W4LSK1: hub for new skins; for now the leather version is realeased. 
Dwemer Readius UI by rob18: a reskin of the UI theme to an ancient Dwemer device display.
The Wooden Pad by NismoMan: a wood and paper themed skin replacer for Dear Diary.

If you want to create your own skin for Dear Diary, please refer to this manual. 
Features:- "Dark Mode" version

Mods support:

• Racemenu
• UIExtensions (Wheel Menu already covered)
• SkyUI AIO Survival

Feel free to leave comments with your suggestions. 
Feel free to report any bug or issue.
And upload your own screenshots please. If you want to support me, just hit the Endorse button.